PLS ANSWER 1. Which describes the role of villi?

They increase the surface area of the small intestine to absorb nutrients.

They produce enzymes that flow into the small intestine to break down nutrients.

They secrete bile that helps break down fat particles in the small intestine.

They move food along the digestive tract by means of peristalsis.

answer: populations of walruses and polar bears will decline

explanation:

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.